• Drill Collar Materials


    Grant Prideco drill collars are manufactured from AISI 4142H-4145H modified steel and are supplied in the "as rolled" surface finish condition. Alternative surface finishes can be provided. Drill collars are trepanned and drifted to API Spec. 7-1. Full-length heat-treatment processes ensure that mechanical properties meet or exceed API Spec. 7-1 requirements. A hardness range of 285-341, Brinell Hardness and Charpy "V' notch minimum impact strength of 40 ft-lb at 70°F are guaranteed one inch below the surface. For material mechanical properties click here

    Grant Prideco drill collar material and process traceability are maintained from receipt of mill certified raw material to completion of all the manufacturing. Serial numbers are die stamped on bar bodies.

    Rigid Inspection Procedures
    We inspect all our H-SERIES drill collars to comply with API standards and our own internal specifications. These inspections include visual dimensional checks as well as ultrasonic inspections over the entire body of the drill collar.